Name:_______________
Date:___________
1. The model that scientists use to describe the structure of matter is the _________ model, which is also known as the ______ model.
2. The atomic model of matter had its beginnings in ancient ______.
3. The atomic model in use today was largely formed by a British scientist named ____ ______.
4. The atom is composed of small particles called _______, ________ and __________.
5. Protons and neutrons are composed of even smaller particles called ______.
6. Protons and neutrons are found in the center or _______ of an atom.
7. Protons have a ________ electrical charge.
8. Neutrons are described as being electrically _______.
9. The number of protons and neutrons in the nucleus of an atom are _____ to each other.
10. ________ are much smaller than protons and neutrons.
11. Electrons orbit the nucleus of an atom in a three dimensional orbital called and _______ _____.
12. In an atom the number of _______ equals the number of _______ equals the number of _________.
13. The number of protons in the nucleus of an atom is called the ______ ______.
14. Protons and neutrons weigh much more than ________.
15. The nucleus of an atom contains __.__% of the mass or weight of an atom.
16. The weight or mass of an atom is expressed in ______ ____ _____, which is abbreviated _ _ _.
17. Protons have a mass of about _ _ _ _, neutrons have a mass of about _ _ _ _, and electrons have a mass of ._ _ _ _ _ _ _ _.
18. The atomic number of carbon is _. Carbon has _ protons and _ neutrons.
19. The atomic mass of carbon is about _ _.
20. The atomic mass (weight) is approximately equal to the number of _______ plus the number of ________.
21. ________ are matter composed of only one kind of atom.
22. The elements are listed in the _______ _____.
23. Hydro means _____ and genesis means _______.
24. The names for elements vary slightly from language to language and from country to country, but the _______ for the elements are universal.
25. The symbols for elements are usually the _____ letter or the _____ ___ letters in the common or Latin name for the element.
26. Tungsten is know in most of the world as _______. The letter _ is the symbol for tungsten.
27. The names for elements are ___ capitalized, but the _____ letter of the symbols ___ capitalized.
28. If two letters are used in a symbol, the _____ is capitalized and the ______ is not capitalized.
29. Do periods follow the symbol for an atom?
30. _________ are matter composed of two or more elements which are chemically bonded together.
31. The smallest unit of a compound is called a ________.